How does X100 manual focus work?

The main reason manual focus works on m4/3 (EVIL) cameras is the focus magnification on their LCD / EVF. Rangefinders work by having two separate images shown on the OVF, which merge together as you get the subject in focus.

How does the hybrid OVF help with manual focus? Or is it autofocus only when using the viewfinder, and manual focus can be only done via the back LCD?